Put the verbs in brackets into the correct form, помогите, пожалуйста

1. If I had known that you were in hospital I (visit) you.
2. If I (know) that you were coming I'd have baked a cake.
3. If you (arrive) ten minutes earlier you would have got a seat.
4. You would have seen my garden at its best if you (be) here last week.
5. I wouldn't have believed it if I (not see) it with my own eyes.
6. I (offer) to help him if I had realized that he was ill.
7. If I (realize) what a bad driver you were I wouldn't have come with you.
8. If he had known that the river was dangerous he (not try) to swim across it.